Edge-Lit LCD Light Guide Plate Lens Prism Patterns
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face challenges in achieving a lightweight, thin, and high-luminance design due to the need for optical sheets between the light guide plate and the LCD panel, which increases thickness and manufacturing complexity.
Innovation Solution
A new frame structure is introduced that omits optical sheets by using a light guide plate with lens and prism patterns, coupled with a frame chassis and lower frame to securely fasten the light source and guide plate, allowing for a more compact and efficient light distribution system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical sheets are used between the light guide plate and LCD panel, then light uniformity is improved, but device thickness increases
Solution Approach 1:
The patent merges the light guiding function and light uniformity function into a single integrated light guide plate structure. The light guide plate incorporates both functional patterns (lens patterns for light extraction and uniformity, and prism patterns for light direction control) directly into its body, eliminating the need for separate optical sheets while maintaining light uniformity and reducing device thickness.
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides light from the edge-mounted light source, extracts light uniformly across the display area through lens patterns, and controls light direction through prism patterns. This multi-functional integration replaces what would traditionally require multiple separate optical components, thereby reducing overall device thickness.
2Illumination intensity
If optical sheets are used between the light guide plate and LCD panel, then light distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple optical functions that would traditionally require separate sheets into a single light guide plate. By integrating lens patterns and prism patterns into one component, the manufacturing process is simplified from assembling multiple precision-aligned optical sheets to producing and installing a single integrated part, thereby reducing manufacturing complexity while maintaining effective light distribution.
Solution Approach 2:
The light guide plate is designed with segmented functional zones: lens patterns in certain regions for optimal light extraction and uniformity, and prism patterns in other regions for light direction control. This segmentation of functions within a single integrated component allows for optimized light distribution while simplifying manufacturing compared to assembling multiple separate optical sheets.
3Length of stationary object
If the light guide plate is closely arranged with the LCD panel, then device thickness is reduced, but structural stability deteriorates
Solution Approach 1:
The patent transitions from a traditional front-mounted light source configuration to an edge-mounted light source configuration. This dimensional change allows the light guide plate to be closely arranged with the LCD panel, reducing device thickness, while the light source is positioned at the edge to provide structural support and stability without interfering with the close arrangement between the light guide plate and display panel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the thickness of the LCD device, enhances light uniformity, and simplifies manufacturing by eliminating the need for optical sheets, while maintaining high luminance and structural integrity.
Implementation Method 1
a light guide plate which receives the light from the light source on a surface thereof and guides the light to another surface thereof
Implementation Method 2
a polarization member on a surface of the display panel facing the light guide plate
Data Source
AI summary
A liquid crystal display device includes: a display panel; a light source which provides a light to the display panel; a light guide plate which receives the light from the light source on a surface thereof and guides the light to another surface thereof; a polarization member on a surface of the display panel facing the light guide plate; and a frame chassis comprising a fastening portion inserted in a space between the display panel and the light guide plate. The fastening portion has a thickness substantially equal to a thickness of the polarization member.